The if Statements

Nested if Statements

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We are going to introduce two new concepts. Let's start with the else if statement. Since the if-else statement only supports two blocks, you might have thought about how you were going to approach issues will multiple possible outcomes. This is where the else if statements comes into play. The else if statement can be used as many times as you like to increase the possible outcomes.

The other concept is nesting if statements. The if and if-else statements can be nested, meaning they can be used inside another if or else statement. Every else statement corresponds to its closest preceding if statement. Always use the curly braces to avoid ambiguity and to make your code more readable. Avoid using more than three levels of nested if statements, and put the case you normally expect before the more rare cases.

The sample code above is a simple program that prints out the number on the dice depending on the value of the variable. As you can see, there are many if statements and else-if statements so that all the possibilities are considered. Nested if statements are used when the dice number is divisible by two. The final console.log() statement under the else statement will print if and only if the value of diceNumber is not between 1 and 6. Try playing around with the value of diceNumber to print different messages.

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Application Question

Consider the following code segment:

let sum = 35;
            if (sum % 10 == 0){
            } else if (sum % 2 == 1){
                if (sum % 5 == 0 && sum % 2 == 0){
                } else if (sum % 5 == 0){
                } else {
            } else {

What will the following code print to the console?